#include <stdio.h>

#define LENGTH 10
#define WIDTH 5
#define NEWLINE '\n'

int main()
{
    int area;

    area = LENGTH * WIDTH;
    printf("value of area: %d", area);
    printf("%c", NEWLINE);

    const int SPEED = 60;
    const int TIME = 10;
    int distance;
    distance = SPEED * TIME;
    printf("value of distance: %d", distance);
    printf("%c", NEWLINE);

    printf("%c, %c, %c, %c", 0101, "\101", "\x41", "A");

    return 0;
}

/**
 * #define const  不是去定义一个常量，而是去改变一个变量的存储类，把该变量所占的内存变为只读
 */
